80 is 25 percent of what number

1 answer:

8 0

So we want to know the number from which we take 25% and get 80. If the number we are looking for is x, then the equation to find that x would be: (25/100)*x=80 which says twenty five percent out of x is equal 80. So, x=(80*100)/25. And finally, x= 8000/25=320. So, 25% out of 320 is 80.

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180^2 + 235^2 = (cliff base to point on bridge)^2
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since x^2 +235^2 = d^2,
substitute (x^2 + 235^2) for d^2, like this:
87625 + x^2 + 235^2 = (x+180)^2
87625 + x^2 + 55225 = x^2 + 360x + 32400
87625 + 55225 - 32400 = x^2 - x^2 +360x
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x = about 306.8 feet
h = x+180, so h = 486.8 feet
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d^2 = 306.8^2 + 235^2
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d = about 386.46 feet

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